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HomeWeb Front-endJS TutorialWrite a simple regular method in JS

Write a simple regular method in JS

Mar 29, 2018 pm 02:58 PM
javascriptWayregular

这次给大家带来在JS里编写简单的正则方式,在JS里编写正则方式的注意事项有哪些,下面就是实战案例,一起来看一下。

在字面量方式中,我们//之间包起来的所有的内容都是元字符,有的具有特殊意义,大部分都是代表本身含义的普通的元字符

var name = 'wo';
      var reg = /^\d+"+name+"\d+$/

为了解决上述想在正则里面加上一个变量这样的需求,我们只能使用实例创建的方式了

var reg = new RegExp("^\\d+"+name+"\\d+$","g")

字面量方式和实例创建的方式在正则中的区别?

1、字面量方式中出现的一切都是元字符,所以不能进行变量值的拼接,而实例创建的方式是可以的。

2、字面量中直接写\d就可以,而在实例中需要把它转译\\d

练习正则:

  1、年龄介于18-65  // 年龄介于18-19  20-59   60-65

 var reg = /^(1[8,9] | [2,5]\d | 6[0,5])$/

  2、验证邮箱的正则(简版)

  邮箱左边的规律:数字、字母、下划线、.、-  

var reg = /^[\w.-]+@[0-9a-zA-Z]+(\.[a-zA-Z]{2,4}){1,2}$/

  3、中国标准真实姓名 2-4位汉字

var reg = /^[\u4e00-\u9fa5]{2,4}$/

  4、身份证号码

 var reg = /^\d{17}(\d | x)$/
  var reg = /^\(d{2})(\d{4})(\d{4})(\d{2})(\d{2})(\d{2})(\d)(\d | X)$/

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